Directional Light

- Directional light
- Sponza sample scene

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Assets/Samples/Materials/StandardAlphaBlended-VolumetricFog.mat

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Assets/Samples/Materials/StandardAlphaBlended-VolumetricFog.shader

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+Shader "Custom/StandardAlphaBlended-VolumetricFog"
+{
+	Properties
+	{
+		_Color ("Color", Color) = (1,1,1,1)
+		_MainTex ("Albedo (RGB)", 2D) = "white" {}
+		_Glossiness ("Smoothness", Range(0,1)) = 0.5
+		_Metallic ("Metallic", Range(0,1)) = 0.0
+	}
+	SubShader
+	{
+		Tags {"Queue" = "Transparent" "RenderType"="Transparent" }
+		LOD 200
+   
+		CGPROGRAM
+ 
+		#pragma surface surf Standard fullforwardshadows alpha finalcolor:ApplyFog
+		#pragma target 3.0
+		#pragma multi_compile _ VOLUMETRIC_FOG
+
+		#if VOLUMETRIC_FOG
+			#include "../../VolumetricFog/Shaders/VolumetricFog.cginc"
+		#endif
+ 
+		sampler2D _MainTex;
+		sampler2D _CameraDepthTexture;
+ 
+		struct Input {
+			float2 uv_MainTex;
+			float4 screenPos;
+		};
+ 
+		void ApplyFog(Input IN, SurfaceOutputStandard o, inout fixed4 color)
+		{
+			#if VOLUMETRIC_FOG
+				half3 uvscreen = IN.screenPos.xyz/IN.screenPos.w;
+				half linear01Depth = Linear01Depth(uvscreen.z);
+				fixed4 fog = Fog(linear01Depth, uvscreen.xy);
+
+				// Always apply fog attenuation - also in the forward add pass.
+				color.rgb *= fog.a;
+
+				// Alpha premultiply mode (used with alpha and Standard lighting function, or explicitly alpha:premul)
+				// uses source blend factor of One instead of SrcAlpha. `color` is compensated for it, so we need to compensate
+				// the amount of inscattering too. A note on why this works: below.
+				#if _ALPHAPREMULTIPLY_ON
+					fog.rgb *= o.Alpha;
+				#endif
+
+				// Add inscattering only once, so in forward base, but not forward add.
+				#ifndef UNITY_PASS_FORWARDADD
+					color.rgb += fog.rgb;
+				#endif
+
+				// So why does multiplying the inscattered light by alpha work?
+				// In other words: how did fog ever work, if opaque objects add all of the inscattered light
+				// between them and the camera, and then the transparencies add even more?
+				//
+				// This is our scene initially:
+				// scene |---is0---------------------------------------> camera
+				//
+				// And that's with the transparent object added in between the opaque stuff and the camera:
+				// scene |---is1---> transparent |---is2---------------> camera
+				//
+				// When rendering, we start with the opaque part of the scene and add all the light inscattered between that and the camera: is0.
+				// Then we add the transparent object. It does two things (let's consider the alpha premultiply version):
+				// - Dims whatever was behind it (including is0) by OneMinusSrcAlpha
+				// - Adds light inscattered in front of it (is2), multiplied by Alpha
+				//
+				// So all in all we end up with this much inscattered light:
+				// is0 * OneMinusSrcAlpha + is2 * Alpha
+				//
+				// Judging by the diagram, though, the correct amount should be:
+				// is1 * OneMinusSrcAlpha + is2
+				//
+				// Turns out the two expressions are equal - who would've thunk?
+				// is1 = is0 - is2
+				// (is0 - is2) * OneMinusSrcAlpha + is2
+				// is0 * OneMinusSrcAlpha - is2 * (1 - Alpha) + is2
+				// is0 * OneMinusSrcAlpha - is2 + is2 * Alpha + is2
+				// is0 * OneMinusSrcAlpha + is2 * Alpha
+
+				// I leave figuring out if the fog attenuation is correct as an exercise to the reader ;)
+			#endif
+		}
+
+		half _Glossiness;
+		half _Metallic;
+		fixed4 _Color;
+ 
+		void surf (Input IN, inout SurfaceOutputStandard o)
+		{
+			fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;
+			o.Albedo = c.rgb;
+			o.Metallic = _Metallic;
+			o.Smoothness = _Glossiness;
+			o.Alpha = c.a;
+		}
+		ENDCG
+	}
+	FallBack "Standard"
+}

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Assets/Samples/Scripts/FreeCam.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using UnityEngine;
+
+/// <summary>
+/// A simple free camera to be added to a Unity game object.
+/// 
+/// Keys:
+///	wasd / arrows	- movement
+///	q/e 			- up/down (local space)
+///	r/f 			- up/down (world space)
+///	pageup/pagedown	- up/down (world space)
+///	hold shift		- enable fast movement mode
+///	right mouse  	- enable free look
+///	mouse			- free look / rotation
+///     
+/// </summary>
+public class FreeCam : MonoBehaviour
+{
+    /// <summary>
+    /// Normal speed of camera movement.
+    /// </summary>
+    public float movementSpeed = 10f;
+
+    /// <summary>
+    /// Speed of camera movement when shift is held down,
+    /// </summary>
+    public float fastMovementSpeed = 100f;
+
+    /// <summary>
+    /// Sensitivity for free look.
+    /// </summary>
+    public float freeLookSensitivity = 3f;
+
+    /// <summary>
+    /// Amount to zoom the camera when using the mouse wheel.
+    /// </summary>
+    public float zoomSensitivity = 10f;
+
+    /// <summary>
+    /// Amount to zoom the camera when using the mouse wheel (fast mode).
+    /// </summary>
+    public float fastZoomSensitivity = 50f;
+
+    /// <summary>
+    /// Set to true when free looking (on right mouse button).
+    /// </summary>
+    private bool looking = false;
+
+    void Update()
+    {
+        var fastMode = Input.GetKey(KeyCode.LeftShift) || Input.GetKey(KeyCode.RightShift);
+        var movementSpeed = fastMode ? this.fastMovementSpeed : this.movementSpeed;
+
+        if (Input.GetKey(KeyCode.A) || Input.GetKey(KeyCode.LeftArrow))
+        {
+            transform.position = transform.position + (-transform.right * movementSpeed * Time.deltaTime);
+        }
+
+        if (Input.GetKey(KeyCode.D) || Input.GetKey(KeyCode.RightArrow))
+        {
+            transform.position = transform.position + (transform.right * movementSpeed * Time.deltaTime);
+        }
+
+        if (Input.GetKey(KeyCode.W) || Input.GetKey(KeyCode.UpArrow))
+        {
+            transform.position = transform.position + (transform.forward * movementSpeed * Time.deltaTime);
+        }
+
+        if (Input.GetKey(KeyCode.S) || Input.GetKey(KeyCode.DownArrow))
+        {
+            transform.position = transform.position + (-transform.forward * movementSpeed * Time.deltaTime);
+        }
+
+        if (Input.GetKey(KeyCode.E))
+        {
+            transform.position = transform.position + (transform.up * movementSpeed * Time.deltaTime);
+        }
+
+        if (Input.GetKey(KeyCode.Q))
+        {
+            transform.position = transform.position + (-transform.up * movementSpeed * Time.deltaTime);
+        }
+
+        if (Input.GetKey(KeyCode.R) || Input.GetKey(KeyCode.PageUp))
+        {
+            transform.position = transform.position + (Vector3.up * movementSpeed * Time.deltaTime);
+        }
+
+        if (Input.GetKey(KeyCode.F) || Input.GetKey(KeyCode.PageDown))
+        {
+            transform.position = transform.position + (-Vector3.up * movementSpeed * Time.deltaTime);
+        }
+
+        if (looking)
+        {
+            float newRotationX = transform.localEulerAngles.y + Input.GetAxis("Mouse X") * freeLookSensitivity;
+            float newRotationY = transform.localEulerAngles.x - Input.GetAxis("Mouse Y") * freeLookSensitivity;
+            transform.localEulerAngles = new Vector3(newRotationY, newRotationX, 0f);
+        }
+
+        float axis = Input.GetAxis("Mouse ScrollWheel");
+        if (axis != 0)
+        {
+            var zoomSensitivity = fastMode ? this.fastZoomSensitivity : this.zoomSensitivity;
+            transform.position = transform.position + transform.forward * axis * zoomSensitivity;
+        }
+
+        if (Input.GetKeyDown(KeyCode.Mouse1))
+        {
+            StartLooking();
+        }
+        else if (Input.GetKeyUp(KeyCode.Mouse1))
+        {
+            StopLooking();
+        }
+    }
+
+    void OnDisable()
+    {
+        StopLooking();
+    }
+
+    /// <summary>
+    /// Enable free looking.
+    /// </summary>
+    public void StartLooking()
+    {
+        looking = true;
+        Cursor.visible = false;
+        Cursor.lockState = CursorLockMode.Locked;
+    }
+
+    /// <summary>
+    /// Disable free looking.
+    /// </summary>
+    public void StopLooking()
+    {
+        looking = false;
+        Cursor.visible = true;
+        Cursor.lockState = CursorLockMode.None;
+    }
+}

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